The number of members logged-in at any moment can vary from a few to about 25. We seldom have more than 25 member's logged-in at the same time. Its the anonymous folks (listed as guests) who aren't logged-in that is causing you confusion. We always have a bunch of guests, and they are constantly changing. For instance, at this moment we have 70 guests. If I come back in an hour, the number may still be at or near 70, but there may have been 100% turn-around since the previous hour. In other words a whole different group of anonymous people, all viewing a bunch of pages. This is happening 24 hours per day, with thousands of guests from around the world.